<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
</head>
<body>
<div>aaa</div>
<div class="header">bbb</div>
<div id="ab">ccc</div>

<script>
(function (global) {

	function jQuery() {

	}

	global.$ = global.jQuery = jQuery;

})(window)
</script>
</body>
</html>